I have a DSD DAC feeding a BHK preamp then to a BHK 250 amp and out to my Focal 1038be speakers. Today, after no change to the system, the audio started sounding thin and bright.
I have a backup office system. On a hunch, I swapped out the BHK Preamp for my Schitt Freya S preamp. The thinness and brightness were gone. I repeated the swap two more times with the same results.
It seems the problem is isolated to the BHK preamp. The easiest thing to do that would not require sending it in for repairs is to swap tubes. They have about 1,500 hours on them. What I don’t know is if thinness and brightness are a symptom when these tubes go south.
Have any of you had a similar experience that was cured by new tubes?